Epidemic investigation of duck circovirus in spontaneous diseased duck flocks in China

The tissues samples of 343 spontaneous diseased ducks from 36 duck flocks were collected in Shandong,Jiangsu,Sichuan,Fujian and Guangdong,and the DNA was extracted to detect duck circovirus(DuCV) by hybridization and PCR.The results showed that the samples of the 5 provinces existed DuCV,and the individual positive ratio of DuCV was 81.63%(280/343) and the flock positive ratio of DuCV was 94.44%(34/36),indicating that the infection of DuCV exists wide-ranging in duck flocks of China.